23009 has 8 divisors (see below), whose sum is σ = 27840. Its totient is φ = 18576.

The previous prime is 23003. The next prime is 23011. The reversal of 23009 is 90032.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23009 - 2⁴ = 22993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22984 and 23002.

It is not an unprimeable number, because it can be changed into a prime (23003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47 + ... + 219.

It is an arithmetic number, because the mean of its divisors is an integer number (3480).

2²³⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

23009 is a deficient number, since it is larger than the sum of its proper divisors (4831).

23009 is a wasteful number, since it uses less digits than its factorization.

23009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 23009 is about 151.6871781002. The cubic root of 23009 is about 28.4423787065.

The spelling of 23009 in words is "twenty-three thousand, nine".